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The correct order of the decreasing ionic radii among the following isoelectronic species is

NEET UG 2010 — Chemistry Physical Chemistry

2010mcqeasy

The correct order of the decreasing ionic radii among the following isoelectronic species is

Official previous-year question

Held on 30 Apr 2010 · Verified 9 Jul 2026.

Options

  1. A

    Ca2+>K+>S2−>Cl−\mathrm{Ca}^{2+}>\mathrm{K}^{+}>\mathrm{S}^{2-}>\mathrm{Cl}^{-}Ca2+>K+>S2−>Cl−

  2. B

    Cl−>S2−>Ca2+>K+\mathrm{Cl}^{-}>\mathrm{S}^{2-}>\mathrm{Ca}^{2+}>\mathrm{K}^{+}Cl−>S2−>Ca2+>K+

  3. C

    S2−>Cl−>K+>Ca2+\mathrm{S}^{2-}>\mathrm{Cl}^{-}>\mathrm{K}^{+}>\mathrm{Ca}^{2+}S2−>Cl−>K+>Ca2+

  4. D

    K+>Ca2+>Cl−>S2−\mathrm{K}^{+}>\mathrm{Ca}^{2+}>\mathrm{Cl}^{-}>\mathrm{S}^{2-}K+>Ca2+>Cl−>S2−

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